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CVE-2024-33621 is an improper input-validation issue in the Linux kernel IPvlan networking implementation. The ipvlan_process_v4_outbound() and ipvlan_process_v6_outbound() paths improperly pass skb->sk to IPv4 and IPv6 local-output processing. When the packet originates from a PF_PACKET socket, this can cause multicast output handling to receive an AF_PACKET socket where another socket type is expected, triggering WARN_ON_ONCE() in sk_mc_loop(). The upstream correction invokes ip_local_out() and ip6_local_out() with a NULL socket from IPvlan outbound processing.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity local vulnerability affecting Google Container-Optimized OS kernel packages, including sys-kernel/csql-kernel-6_1 and sys-kernel/lakitu-kernel-6_1, remediated by updating to version 18244.151.9 or later. The listed CVSS v3 score is 7.1, with impacts to confidentiality and availability.
Linux kernel IPvlan networking flaw caused by using skb->sk in IPv4 and IPv6 outbound processing.
Linux kernel IPvlan outbound packet socket-pointer handling flaw.
Linux kernel IPvlan flaw caused by use of skb->sk in IPv4 and IPv6 outbound processing.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.